CN100394739C - A Method for Guaranteeing Quality of Service in Mobile Ad Hoc Networks - Google Patents

Abstract

The invention discloses a method for guaranteeing the service quality of a MANET network, comprising: A. classifying the service providing nodes in the MANET network, distributing files to be played segmentally on various service providing nodes, and configuring corresponding Based on the BSP List of each type of service provider node; B. The client node selects a resource location information from the obtained resource location information, respectively establishes a connection between itself and each type of service provider node, and saves the unselected resource location information to In the BSP List corresponding to this type of service provider node; C. The client node accepts the file fragments to be played provided by various service provider nodes at the same time, and executes step D after the service provided by a certain type of service provider node is interrupted; D. The client node starts from Select a piece of resource location information from the BSP List corresponding to this type of service provider node, and establish a connection between itself and the service provider node, and turn to step C. The invention effectively guarantees the service quality of the MANET network.

Description

A Method for Guaranteeing Quality of Service in Mobile Ad Hoc Networks

technical field

The present invention relates to the technical field of mobile ad-hoc networks (Mobile Ad-hoc Networks, MANET), in particular to a method for guaranteeing the quality of service of the MANET network.

Background technique

MANET network is a mobile ad hoc network without any central entity. With the support of various protocols designed in advance, it relies on the mutual cooperation between nodes to form a network by itself in a mobile, complex and changeable wireless environment. Jump forwarding technology is used to make up for the limited transmission distance of wireless devices. It has the characteristics of strong networking flexibility, support for mobility, easy and rapid deployment, strong overall system invulnerability, and low system cost.

With the development of computer network technology, the application scope of MANET network is also expanding constantly, and more and more applications sensitive to quality of service (QoS) are deployed in MANET network. Such as streaming media, high-bandwidth content transmission and VoIP (Vioce over Internet Protocol, VoIP) technology. Therefore, it becomes very necessary to guarantee the quality of service of the MANET network.

Compared with the traditional wired network, the MANET network has the characteristics of link unpredictability, node mobility, route maintenance and node capability differences, etc. These characteristics lead to the great dynamics of its network environment. Therefore, the traditional service quality assurance strategy is no longer applicable in the MANET network environment.

People have done a lot of work in improving the performance of MANET networks, including network architecture, Media Access Control (MAC) access mechanism, design of quality of service routing protocols suitable for MANET networks, and implementation of quality of service on 802.11 technology, middleware that guarantees service quality, etc.

In addition, the quality of service guarantee mechanism of differentiated service (DiffServ) and integrated service (InteServ) is also modified and applied to MANET network. However, there are still various problems in the above two mechanisms. For example, the quality of service guarantee mechanism for differentiated services will take a lot of time when relocating resources, and the quality of service guarantee mechanism for integrated services needs to modify the protocol stack of each node. These problems make it difficult for the above two mechanisms to be widely deployed and applied to actual MANET networks, and cannot effectively guarantee the service quality of MANET networks.

Therefore, there is an urgent need to provide a technology for effectively guaranteeing the quality of service of the MANET network.

Contents of the invention

(1) Technical problems to be solved

Aiming at the deficiencies in the prior art above, the main purpose of the present invention is to provide a method for guaranteeing the quality of service of the MANET network, so as to effectively guarantee the quality of service of the MANET network.

(2) Technical solution

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for guaranteeing MANET network service quality, the method comprising:

A. Classify the service-providing nodes in the MANET network, segment the files to be played, and configure the segments of the files to be played to various service-providing nodes in sequence according to the order of segmentation, and configure the same on the same type of service-providing nodes The file segment to be played, and configure the backup service provider node list (Backup ServiceProvider List, BSP List) corresponding to each type of service provider node for the client node;

B. The client node selects a resource location information from the resource location information obtained by each type of service provider node, and establishes a connection between itself and the service provider node corresponding to the selected resource location information according to the selected resource location information, and will start from each The resource location information acquired by the class service provider node and not selected is saved in the BSP List corresponding to the class service provider node;

C. The client node accepts the file fragments to be played provided by various service providing nodes at the same time, and the client node caches the file fragments to be played provided by various service providing nodes in the high-speed buffer memory Cache corresponding to the service providing node, and Read each Cache in turn, play the content read from each Cache to the user, and execute step D after the service provided by a certain type of service provider node is interrupted;

D. The client node selects a resource location information from the BSP List corresponding to this type of service provider node, and establishes a connection between itself and the service provider node corresponding to the selected resource location information, and then executes step C.

When the file to be played is segmented in step A, if the number of file segments to be played is greater than the number of service provider node categories, step A further includes: reconfiguring the remaining file segments to be played in sequence according to the sequence of segments to various service providers.

Before the step B, it further includes: the client node sends a broadcast message to each type of service provider node, requesting to obtain resource location information of each type of service provider node;

Each type of service provider node receives the broadcast message sent by the client node, carries its own resource location information in the response message and returns it to the client node;

The client node receives the response message returned by each type of service provider node, and executes step B.

After the client node receives the response message returned by each type of service provider node, it further includes:

The client node judges the number of response messages received from each type of service provider node. If the number of response messages received from a certain type of service provider node is one, it sends a broadcast message to this type of service provider node again. Step B is executed after the resource location information of the service provider node; if the number of response messages received from each type of service provider node is more than one, step B is executed.

The client node in step B selects a resource location information from the resource location information obtained by each type of service provider node including:

The client node judges the response time of the response message carrying resource location information, and selects the resource location information carried in the response message with short response time;

Or the client node judges the bandwidth information contained in the resource location information, and selects the resource location information with large bandwidth;

Alternatively, the client node judges the hop count information included in the resource location information, and selects resource location information with a small hop count.

In step C, after the service provided by a certain type of service provider node is interrupted, it further includes: the client node continues to read and cache the Cache of the file segment to be played provided by this type of service provider node, and plays the content read from the Cache to the user .

After the file segment to be played in the Cache is read and played, the interrupted service has not been resumed, the method further includes: the client node sequentially jumps to the Cache corresponding to the next type of service provider node, reads The file segment to be played is cached in the Cache, and the read content is played to the user.

The client node described in step D further includes before selecting a resource location information from the BSP List corresponding to the service provider node of this type: the client node checks the BSP List corresponding to the service provider node of this class, if the corresponding BSP List is empty, Then obtain the resource location information from the service provider node of the MANET network again, and select a resource location information from the obtained resource location information; otherwise, directly execute the selection of a resource location information from the corresponding BSP List.

After selecting a resource location information from the obtained resource location information, it further includes: the client node saves the unselected resource location information in the BSP List corresponding to the service provider node of this type.

The acquisition of resource location information from this type of service provider node in the MANET network again is realized by the client node sending a broadcast message to this type of service provider node in the MANET network.

The client node described in step D selects a resource location information from the BSP List corresponding to the service provider node of this type including:

The client node judges the response time of the response message carrying resource location information, and selects the resource location information carried in the response message with short response time;

Or the client node judges the bandwidth information contained in the resource location information, and selects the resource location information with large bandwidth;

Alternatively, the client node judges the hop count information included in the resource location information, and selects resource location information with a small hop count.

The resource location information includes at least the address of the service providing node and the specific location of the resource on the service providing node.

The resource location information further includes path information of the service providing node.

(3) Beneficial effects

As can be seen from the foregoing technical solutions, the present invention has the following beneficial effects:

1. Using the present invention, by introducing cache, resource location information backup and load balancing mechanism in the MANET network, the files to be transmitted are evenly distributed on multiple types of service providing nodes, and for each type of service providing nodes, client nodes are respectively Resource location, cache the service content provided by each type of service provider node into its own Cache, then read each Cache, play the service content read from the Cache to the user, and use the redundant information obtained in the resource location process The resource location information is cached in the BSPList corresponding to this type of service provider node for backup. When the service is interrupted, the client node uses the backup resource location information to recover, which shortens the time required for service recovery and effectively guarantees the service quality of the MANET network.

2. With the present invention, during the entire query and reconnection process after service interruption, the client node continues to play the service content cached in the Cache, which reduces the number and time of playback interruptions and greatly improves the continuity of traffic playback. Multiple service provider nodes send data at the same time. When a service provider node has a service interruption, the client still has data to arrive and play, which further improves the continuity of data playback and provides a powerful guarantee for the service quality of the MANET network. Assure.

3. Utilizing the present invention, since the resource location information is backed up in the BSP List, after the service is interrupted, the time required for resource relocation is shortened, and the service quality of the MANET network is effectively guaranteed.

4. Utilize the present invention, because the method for guaranteeing MANET network service quality provided by the present invention does not need to change the hardware equipment in the existing MANET network, and does not need to increase hardware equipment in the existing MANET network, it is based on existing equipment and The quality of service guarantee strategy of the protocol can provide an application programming interface (Application Programming Interface, API) that guarantees the quality of service without modifying the existing network structure, which is more conducive to the widespread promotion and application of the present invention.

Description of drawings

Figure 1 is a schematic diagram of the relationship between qd and Cache size;

Fig. 2 is a schematic diagram of the relationship between qt and Cache size;

Fig. 3 is a schematic diagram of the relationship between qd and the number m of service providing node categories;

Fig. 4 is a schematic diagram of the relationship between qt and the number m of service providing node categories;

Fig. 5 is the realization flowchart of the overall technical scheme of guaranteeing MANET network quality of service provided by the present invention;

Fig. 6 is a flowchart of a method for guaranteeing service quality of a MANET network according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

The core content of the present invention is: by introducing caching, resource location information backup and load balancing mechanism in MANET network, the files to be transmitted are evenly distributed on multiple types of service providing nodes, and for each type of service providing nodes, client nodes are respectively Perform resource location, cache the service content provided by each type of service provider node in their own Cache, then read each Cache, play the service content read from each Cache to the user, and The redundant resource location information is cached in the BSP List corresponding to this type of service provider node for backup. When the service is interrupted, the client node continues to play the service content cached in the Cache, and at the same time uses the backup resource location information to restore, effectively providing a guarantee for the service quality of the MANET network.

The implementation principle of the technical solution provided by the present invention will be introduced in detail below.

 ……公式11.

……Formula 1

 ……公式22.

...Formula 2

The above formula 1 reflects the quality of service in terms of data transmission. When the packet loss rate of the network is higher and the quality of service cannot be guaranteed, qd is smaller. The above formula 2 reflects the quality of service in terms of service time, when the client node is interrupted for more time, the value of qt is larger. Various service assurance strategies should try to increase qd and reduce qt as much as possible.

Figure 1 and Figure 2 respectively reflect the relationship between qd and qt and the size of the Cache, wherein Figure 1 is a schematic diagram of the relationship between qd and the size of the Cache, and Figure 2 is a schematic diagram of the relationship between qt and the size of the Cache. Obviously, it can be seen from Figure 1 and Figure 2 that with the increase of Cache, the larger the qd, the smaller the qt, and the better the service quality. However, due to the limited storage capacity of mobile devices and economic conditions, setting a particularly large Cache is unrealistic, therefore, the scope of Cache among the present invention is max(t')*s≤c≤max(t+t')*s, wherein c is the size of Cache, s is the playback rate of client, t' is the time required for the client to establish a connection with the service provider node, and t is the time for the client to relocate the resource.

Figure 3 and Figure 4 respectively reflect the relationship between qd, qt and the number m of service provider node categories, where Figure 3 is a schematic diagram of the relationship between qd and service provider node category number m, and Figure 4 is the relationship between qt and service provider node Schematic diagram of the relationship between the number of categories m. As can be seen from the figure, both qd and qt decrease with the increase of m. Since multiple service providing nodes provide data to clients at the same time in the present invention, playback interruptions in the process of providing services are greatly reduced. Possibility, thereby greatly improving the service quality of MANET network.

However, the increase of m does not improve the quality of service significantly. At the same time, with the increase of m, more service provider nodes provide services at the same time, and the probability of network failure and packet loss also increases, which affects the service quality of data transmission. Therefore, in the actual configuration, the setting of m is the same as It is related to the specific environment and should not be too large.

Based on the above principles, Fig. 5 and Fig. 6 show the method for guaranteeing the quality of service of the MANET network provided by the present invention. As shown in Fig. 5, Fig. 5 is the realization flowchart of the overall technical scheme of guaranteeing MANET network quality of service provided by the present invention, and this method comprises the following steps:

Step 501: Classifying the service providing nodes in the MANET network, disposing the segmented file to be played on various service providing nodes, and configuring the BSP List corresponding to each type of service providing node for the client node;

Step 502: The client node selects a piece of resource location information from the resource location information obtained by each type of service provider node, respectively establishes a connection between itself and each type of service provider node, and unselected resources obtained from each type of service provider node The location information is saved in the BSP List corresponding to the service provider node of this type;

Step 503: the client node accepts the file fragments to be played provided by various service providing nodes at the same time, and executes step 504 after the service provided by a certain type of service providing node is interrupted;

Step 504: The client node selects a resource location information from the BSP List corresponding to this type of service provider node, and establishes a connection between itself and the service provider node corresponding to the selected resource location information, and then executes step 503.

In step 501 above, configuring segments of the file to be played on various service providing nodes includes: segmenting the file to be played, and distributing the segments of the file to be played to various service providing nodes in sequence according to the order of the segments, and Configure the same file segment to be played on the same type of service provider node. When the number of file segments to be played is greater than the number of service-providing node categories, the method further includes: reconfiguring the remaining file segments to be played to various service-providing nodes in sequence according to the sequence of segments.

For example, assuming that the number of service providing node categories is m, the file to be played is divided into p segments when segmenting the file to be played, where m and p are integers greater than 0, and p is greater than m. In step 501, the segmented configuration of the file to be played on various service providing nodes is to configure the first segment of the file to be played on the 0th type of service providing node, and configure the second segment of the file to be played on the node On the type 1 service provider node, ..., configure the m-th file segment to be played on the m-1 type service provider node; then, configure the m+1-th file segment to be played on the 0th type service provider On the node, configure the m+2th file segment to be played on the first type of service provider node, ..., and so on, until all the file segments to be played are configured on various service provider nodes.

Before the above step 502, it may further include: the client node sends a broadcast message to each type of service provider node, requesting to obtain the resource location information of each type of service provider node; each type of service provider node receives the broadcast message sent by the client node, and uses its own resources The positioning information is carried in the response message and returned to the client node; the client node receives the response message returned by each type of service provider node, and executes step 502 .

After the above client node receives the response message returned by each type of service provider node, it further includes: the client node judges the number of response messages received from each type of service provider node, if the number of response messages received from a certain type of service provider node is one, Then send a broadcast message to this type of service provider node again, and execute step 502 after obtaining the resource location information of this type of service provider node again; if the number of response messages received from each type of service provider node is multiple, then execute step 502. 502.

After the client node in the above step 503 accepts the file fragments to be played provided by various service providing nodes at the same time, it further includes: the client node respectively caches the file fragments to be played provided by various service providing nodes in corresponding to the service providing nodes. The cache is stored in the high-speed memory Cache, and each Cache is read in turn, and the content read from each Cache is played to the user.

Said in the above step 503, after the service provided by a certain type of service provider node is interrupted, it further includes: the client node continues to read and cache the Cache of the file segment to be played provided by the service provider node of this type, and plays the content read from the Cache to the user.

After the file segment to be played in the Cache is read and played, the interrupted service has not been resumed, the method further includes: the client node sequentially jumps to the Cache corresponding to the next type of service provider node, reads The file segment to be played is cached in the Cache, and the read content is played to the user.

Before the client node described in step 504 selects a resource location information from the BSP List corresponding to this type of service provider node, it further includes: the client node checks the BSP List corresponding to this type of service provider node, if the corresponding BSP List is empty , then obtain the resource location information from the service provider node of the MANET network again, and select a resource location information from the obtained resource location information; otherwise, directly execute the selection of a resource location information from the corresponding BSP List.

After selecting a resource location information from the obtained resource location information, the above step further includes: the client node saves the unselected resource location information in the BSP List corresponding to this type of service provider node.

Based on the overall technical solution for guaranteeing MANET network service quality of the present invention described in FIG. 5 , FIG. 6 shows a flowchart of a method for guaranteeing MANET network service quality according to an embodiment of the present invention. In the present embodiment, the customer node in the MANET network is connected with m BSP Lists, m is an integer greater than 1, and each BSP List corresponds to a class of service providing nodes, and the method includes the following steps:

Step 601: The client node in the MANET network sends a broadcast message to the i-th type service provider node in the MANET network, requesting to obtain the resource location information of the i-th type service provider node, where i is greater than or equal to 0 and less than or equal to m-1 Integer, the initial value of i is 0;

The resource location information includes at least the address of the service provider node and the specific location of the resource in the service provider node. The address of the service provider node may be the IP address of the service provider node; in addition, the resource location information may further include the service provider The path information of the node; the client node can establish a connection between itself and the service provider node according to the information carried in the resource location information, and accept the service provided by the service provider node.

Step 602: The service provider node of type i in the MANET network receives the broadcast message sent by the client node, and carries its own resource location information in the response message and returns it to the client node.

Step 603: The client node receives the response message returned by the service provider node of the i type, and judges the number of the received response message, if the number of the response message is one, execute step 604; if the number of the response message is more than one , then execute step 605;

In this step, each response message carries a resource location information, if the client node only receives one response message, then the client node only obtains one resource location information; if the client node receives multiple response messages, then the client node obtains multiple resources positioning information.

Step 604: The client node sends a broadcast message to the i-th service provider node in the MANET network again, requesting to obtain the resource location information of the i-type service provider node, and executes after obtaining the resource location information of the i-th service provider node again Step 605.

Step 605: The client node selects a resource location information from the obtained resource location information of the i-th type service provider node, and saves the unselected resource location information in the BSP List connected to itself and corresponding to the i-th type service provider node ;

In this step, the client node selects a resource location information from the obtained resource location information of the i-th type service provider node including:

The client node judges the response time of the response message carrying resource location information, and selects the resource location information carried in the response message with short response time;

Or the client node judges the bandwidth information contained in the resource location information, and selects the resource location information with large bandwidth;

Alternatively, the client node judges the hop count information included in the resource location information, and selects resource location information with a small hop count.

Step 606: The client node judges the value of i. If i is less than m-1, that is, the client node has not obtained the resource location information of all m-type service provider nodes, it adds 1 to the value of i, and then executes step 601 to obtain the next If i is equal to m-1, that is, the client node has acquired resource location information of all m-type service provider nodes, go to step 607.

Step 607: According to the selected m pieces of resource location information, the client node establishes a connection between itself and m-type service provider nodes corresponding to the selected resource location information, and accepts services provided by m-type service provider nodes.

Step 608: The client node caches the file fragments to be played provided by m types of service providing nodes into m caches respectively, and caches the file fragments to be played provided by each type of service providing nodes into one cache, and reads the m caches. Cache, playing the content read from the m caches to the user.

Step 609: During the playing process, when a certain type of service provider node leaves or the service provided by this type of service provider node is interrupted due to service path disconnection, the client node checks the corresponding BSP List, if the corresponding BSP List is empty, then execute step 610; otherwise, execute step 613;

Further, when the service is interrupted, the client node continues to read the m caches sequentially, and plays the content read from the m caches to the user.

Step 610: the client node in the MANET network sends a broadcast message to the service provider node in the MANET network again, requesting to obtain the resource location information of the service provider node in the MANET network.

Step 611: After obtaining the resource location information of this type of service provider node, the client node selects a resource location information from the relocated resource location information, and saves the unselected resource location information in the corresponding In the BSP List;

In this step, the client node selects a resource location information from the resource location information obtained by relocation including:

The client node judges the response time of the response message carrying resource location information, and selects the resource location information carried in the response message with short response time;

Or the client node judges the bandwidth information contained in the resource location information, and selects the resource location information with large bandwidth;

Alternatively, the client node judges the hop count information included in the resource location information, and selects resource location information with a small hop count.

Step 612: The client node establishes a connection between itself and the service provider node corresponding to the selected resource location information, accepts the service provided by this type of service provider node, restores the interrupted service, and ends the process.

Step 613: the client node selects a resource location information from the corresponding BSP List according to a certain strategy, and establishes a connection between itself and the service provider node corresponding to the selected resource location information, and accepts the service provided by the service provider node, Resume interrupted service.

During the entire query and reconnection process after the service interruption, the client node keeps playing the file fragments to be played and cached in the corresponding Cache, so that the entire service interruption and recovery process is invisible to the user. If the file segment to be played in the corresponding Cache has been played and the service has not been restored, the client node will continue to play the file segment to be played cached in the next Cache, which greatly improves the continuity of traffic playback.

In the present invention, the files to be played are evenly segmented and distributed to several types of service providing nodes. Multiple service providing nodes send data to client nodes at the same time. When a service providing node has a service interruption due to equipment or network reasons, Client nodes can still receive and play data provided by other service provider nodes.

In addition, the use of BSP List shortens the time required for resource relocation after the service is interrupted; and the use of Cache makes it possible for nodes to persist in resource relocation time and reconnection time when the service is interrupted. Continuous playback.

In step 605 of this embodiment of the present invention, when the client node selects a piece of resource location information from the obtained resource location information of the i-th type service provider node, it selects according to the response time of the response message carrying the resource location information. The resource location information carried in the response message with a short response time, or according to the bandwidth information contained in the resource location information, select the resource location information with large bandwidth, or the client node judges the hop number information contained in the resource location information, and selects the resource location information with a small number of hops resource location information. In practical applications, when the client node selects one resource location information from the obtained resource location information of the i-th type service provider node, it may choose according to actual needs or other strategies. Such a technical solution is consistent with the technical solutions mentioned in the embodiments of the present invention in terms of ideas, and should be included in the protection scope of the present invention.

In step 611 of this embodiment of the present invention, when the client node selects a resource location information from the resource location information obtained by relocation, it selects a response with a short response time according to the response time of the response message carrying the resource location information. The resource location information carried in the message, or according to the bandwidth information contained in the resource location information, select the resource location information with large bandwidth, or the client node judges the hop number information contained in the resource location information, and selects the resource location information with a small hop number. In practical applications, when the client node selects a piece of resource location information from the resource location information obtained through relocation, it may choose according to actual needs or other strategies. Such a technical solution is consistent with the technical solutions mentioned in the embodiments of the present invention in terms of ideas, and should be included in the protection scope of the present invention.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. a method that ensures service quality of mobile self-organization network is characterized in that, this method comprises:

A, the service providing node among the mobile ad-hoc network MANET is classified, treat played file and carry out segmentation, file fragment to be played is configured to all kinds of service providing node successively according to the sequencing of segmentation, and the identical file fragment to be played of configuration on same class service providing node, and the backup services that disposes corresponding to every class service providing node for client node provides node listing BSP List;

B, client node are selected a resource location information from the resource location information that every class service providing node is obtained, according to the resource location information of choosing set up self with corresponding to being connected between the service providing node of the resource location information of selecting, will obtain and unchecked resource location information is saved in the BSP List corresponding with such service providing node from every class service providing node;

C, client node are accepted the file fragment to be played that all kinds of service providing node provide simultaneously, the file fragment to be played that client node provides all kinds of service providing node is cached to respectively among the cache Cache corresponding with such service providing node, and read each Cache successively, the content play that will read from each Cache is given user, execution in step D after the service disruption that certain class service providing node provides;

D, client node are selected a resource location information from the BSP List corresponding with such service providing node, and set up self with corresponding to being connected between the service providing node of the resource location information of selecting, then execution in step C.

2. method according to claim 1 is characterized in that, when treating played file described in the steps A and carrying out segmentation, if file fragment number to be played greater than service providing node classification number, then described steps A further comprises:

Remaining file fragment to be played is configured to all kinds of service providing node again successively according to the sequencing of segmentation.

3. method according to claim 1 is characterized in that, further comprises before the described step B:

Client node sends broadcast, the resource location information of the every class service providing node of acquisition request to every class service providing node;

Every class service providing node receives the broadcast that client node sends, and its other resources locating information is carried at returns to client node in the response message;

Client node receives the response message that every class service providing node is returned, execution in step B.

4. method according to claim 3 is characterized in that, described client node further comprises after receiving the response message that every class service providing node returns:

Client node is judged the number that is received from every class service providing node response message, if being received from the number of certain class service providing node response message is one, then send broadcast, execution in step B after the resource location information that gets access to such service providing node once more to such service providing node once more; If it is a plurality of being received from the number of every class service providing node response message, then execution in step B.

5. method according to claim 3 is characterized in that, client node described in the step B selects a resource location information to comprise from the resource location information that every class service providing node is obtained:

Client node is judged the response time of carrying the resource location information response message, selects the resource location information of carrying in the response message of response time weak point;

Perhaps client node is judged the bandwidth information that comprises in the resource location information, the resource location information that select tape is roomy;

Perhaps client node is judged the jumping figure information that comprises in the resource location information, selects the few resource location information of jumping figure.

6. method according to claim 1 is characterized in that, further comprises after the service disruption that certain class service providing node provides described in the step C:

Client node continues to read the Cache that such service providing node of buffer memory provides file fragment to be played, and the content play that will read from Cache is given the user.

7. method according to claim 6 is characterized in that, after the file fragment to be played among the described Cache was read and plays, the service of described interruption did not also recover, and this method further comprises:

Client node jumps to the Cache corresponding with next class service providing node in proper order, reads the file fragment to be played of buffer memory among this Cache, and gives the user with the content play that reads.

8. method according to claim 1 is characterized in that, client node described in the step D is selected further to comprise before the resource location information from the BSP List corresponding with such service providing node:

Client node is checked the BSP List corresponding with such service providing node, if corresponding BSPList is empty, then obtain resource location information from such service providing node of MANET network once more, and from the resource location information of obtaining, select a resource location information; Otherwise, directly carry out the described resource location information of from the BSP List of correspondence, selecting.

9. method according to claim 8 is characterized in that, the described selection from the resource location information of obtaining further comprises after a resource location information:

Client node is saved in unchecked resource location information among the BSP List corresponding with such service providing node.

10. method according to claim 8 is characterized in that, describedly obtains resource location information from such service providing node of MANET network once more, is that client node passes through in the MANET network such service providing node and sends broadcast and realize.

11. method according to claim 1 is characterized in that, client node described in the step D selects a resource location information to comprise from the BSP List corresponding with such service providing node:

Client node is judged the response time of carrying the resource location information response message, selects the resource location information of carrying in the response message of response time weak point;

Perhaps client node is judged the bandwidth information that comprises in the resource location information, the resource location information that select tape is roomy;

Perhaps client node is judged the jumping figure information that comprises in the resource location information, selects the few resource location information of jumping figure.

12., it is characterized in that described resource location information comprises the address of service providing node and the resource particular location in service providing node at least according to claim 1,3,4,5,8,9,10 or 11 each described methods.

13. method according to claim 12 is characterized in that, described resource location information further comprises the routing information of service providing node.

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